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1012 B

Array.prototype.forEach = undefined
Array.prototype.map = undefined
// /*/ // ⚡
export const tests = []
const t = f => tests.push(f)
export const setup = () => {
const arr = [1, 2, 3, 4, 5, Math.random(), 7, 10, -10, 20, -95]
Object.getPrototypeOf([]).proto = ' [avoid for..in] '
return { arr }
}
t(({ eq, ctx }) => {
// callback is call with the item value
const result = []
const returned = forEach(ctx.arr, value => result.push(value))
return eq([returned, result], [undefined, ctx.arr])
})
t(({ eq, ctx }) => {
// callback second parameter is the index
const result = []
const returned = forEach(ctx.arr, (_, index) => result.push(index))
return eq([returned, result], [undefined, [...ctx.arr.keys()]])
})
t(({ eq, ctx }) => {
// callback third parameter is the array
const result = []
const returned = forEach(ctx.arr, (_, __, arr) => result.push(arr))
return eq(
[returned, result],
[undefined, Array(ctx.arr.length).fill(ctx.arr)],
)
})
Object.freeze(tests)